Good point.
I think the original design limits the usage to be variable driver. As such, the API only gets a “variable root key”.
A “platform root key” can derive the “variable root key” and some “other features’ root key”.
The tricky part is to regenerate the key, when the variable is under attack.
In that case, we want to only regenerate the “variable root key”, instead of “platform root key”.
That’s why we want to introduce a variablekeylib module.
To make API consistent, maybe we should rename GetVariableRootKey() to GetVariableKey(), RegenerateKey() to RegenerateVariableKey(), and LockKeyInterface() to LockVariableKeyInterface()
If we really want to create a generic platformkeylib module, then we need add a key indicator. Such as:
EFI_STATUS
EFIAPI
GetPlatformKey (
IN GUID *KeyIndicator,
OUT VOID **PlatformKey,
IN OUT UINTN *PlatformKeySize
);
Then the variable driver can pass a GUID, and any other feature driver can pass anther GUID.
Thank you
Yao Jiewen
From: Bret Barkelew <Bret.Barkelew@microsoft.com>
Sent: Wednesday, March 25, 2020 1:44 AM
To: devel@edk2.groups.io; Wang, Jian J <jian.j.wang@intel.com>
Cc: Yao, Jiewen <jiewen.yao@intel.com>; Zhang, Chao B <chao.b.zhang@intel.com>; Mistry, Nishant C <nishant.c.mistry@intel.com>
Subject: RE: [EXTERNAL] [edk2-devel] [PATCH v4 1/3] SecurityPkg: add RpmcLib and VariableKeyLib public headers
Is there a reason this needs to be called “VariableKeyLib” rather than any other “KeyLib”? It seems general-purpose as an interface.
- Bret
From:
devel@edk2.groups.io <devel@edk2.groups.io> on behalf of Wang, Jian J via Groups.Io <jian.j.wang=intel.com@groups.io>
Sent: Monday, March 23, 2020 11:35:21 PM
To: devel@edk2.groups.io <devel@edk2.groups.io>
Cc: Jiewen Yao <jiewen.yao@intel.com>; Chao Zhang <chao.b.zhang@intel.com>; Nishant C Mistry <nishant.c.mistry@intel.com>
Subject: [EXTERNAL] [edk2-devel] [PATCH v4 1/3] SecurityPkg: add RpmcLib and VariableKeyLib public headers
> v4: remove CounterId which should not be exposed
REF:
https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.tianocore.org%2Fshow_bug.cgi%3Fid%3D2594&data=02%7C01%7Cbret.barkelew%40microsoft.com%7C3e34ac4a40d94c82e86b08d7cfbd8b82%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637206285305504454&sdata=wCxxsc6cc%2Ffduq88XOZOZv6debpAQMZiIdsFjD0zHXE%3D&reserved=0
RpmcLib.h and VariableKeyLib.h are header files required to access RPMC
device and Key generator from platform. They will be used to ensure the
integrity and confidentiality of NV variables.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Nishant C Mistry <nishant.c.mistry@intel.com>
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
---
SecurityPkg/Include/Library/RpmcLib.h | 42 ++++++++++++++
SecurityPkg/Include/Library/VariableKeyLib.h | 59 ++++++++++++++++++++
SecurityPkg/SecurityPkg.dec | 8 +++
3 files changed, 109 insertions(+)
create mode 100644 SecurityPkg/Include/Library/RpmcLib.h
create mode 100644 SecurityPkg/Include/Library/VariableKeyLib.h
diff --git a/SecurityPkg/Include/Library/RpmcLib.h b/SecurityPkg/Include/Library/RpmcLib.h
new file mode 100644
index 0000000000..8e3868516c
--- /dev/null
+++ b/SecurityPkg/Include/Library/RpmcLib.h
@@ -0,0 +1,42 @@
+/** @file
+ Public definitions for the Replay Protected Monotonic Counter (RPMC) Library.
+
+Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef _RPMC_LIB_H_
+#define _RPMC_LIB_H_
+
+#include <Uefi/UefiBaseType.h>
+
+/**
+ Requests the monotonic counter from the designated RPMC counter.
+
+ @param[out] CounterValue A pointer to a buffer to store the RPMC value.
+
+ @retval EFI_SUCCESS The operation completed successfully.
+ @retval EFI_DEVICE_ERROR A device error occurred while attempting to update the counter.
+ @retval EFI_UNSUPPORTED The operation is un-supported.
+**/
+EFI_STATUS
+EFIAPI
+RequestMonotonicCounter (
+ OUT UINT32 *CounterValue
+ );
+
+/**
+ Increments the monotonic counter in the SPI flash device by 1.
+
+ @retval EFI_SUCCESS The operation completed successfully.
+ @retval EFI_DEVICE_ERROR A device error occurred while attempting to update the counter.
+ @retval EFI_UNSUPPORTED The operation is un-supported.
+**/
+EFI_STATUS
+EFIAPI
+IncrementMonotonicCounter (
+ VOID
+ );
+
+#endif
\ No newline at end of file
diff --git a/SecurityPkg/Include/Library/VariableKeyLib.h b/SecurityPkg/Include/Library/VariableKeyLib.h
new file mode 100644
index 0000000000..fe642b3d66
--- /dev/null
+++ b/SecurityPkg/Include/Library/VariableKeyLib.h
@@ -0,0 +1,59 @@
+/** @file
+ Public definitions for Variable Key Library.
+
+Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef _VARIABLE_KEY_LIB_H_
+#define _VARIABLE_KEY_LIB_H_
+
+#include <Uefi/UefiBaseType.h>
+
+/**
+ Retrieves the variable root key.
+
+ @param[out] VariableRootKey A pointer to pointer for the variable root key buffer.
+ @param[in,out] VariableRootKeySize The size in bytes of the variable root key.
+
+ @retval EFI_SUCCESS The variable root key was returned.
+ @retval EFI_DEVICE_ERROR An error occurred while attempting to get the variable root key.
+ @retval EFI_ACCESS_DENIED The function was invoked after locking the key interface.
+ @retval EFI_UNSUPPORTED The variable root key is not supported in the current boot configuration.
+**/
+EFI_STATUS
+EFIAPI
+GetVariableRootKey (
+ OUT VOID **VariableRootKey,
+ IN OUT UINTN *VariableRootKeySize
+ );
+
+/**
+ Regenerates the variable root key.
+
+ @retval EFI_SUCCESS The variable root key was regenerated successfully.
+ @retval EFI_DEVICE_ERROR An error occurred while attempting to regenerate the root key.
+ @retval EFI_ACCESS_DENIED The function was invoked after locking the key interface.
+ @retval EFI_UNSUPPORTED Key regeneration is not supported in the current boot configuration.
+**/
+EFI_STATUS
+EFIAPI
+RegenerateKey (
+ VOID
+ );
+
+/**
+ Locks the regenerate key interface.
+
+ @retval EFI_SUCCESS The key interface was locked successfully.
+ @retval EFI_UNSUPPORTED Locking the key interface is not supported in the current boot configuration.
+ @retval Others An error occurred while attempting to lock the key interface.
+**/
+EFI_STATUS
+EFIAPI
+LockKeyInterface (
+ VOID
+ );
+
+#endif
\ No newline at end of file
diff --git a/SecurityPkg/SecurityPkg.dec b/SecurityPkg/SecurityPkg.dec
index 5335cc5397..2cdfb02cc5 100644
--- a/SecurityPkg/SecurityPkg.dec
+++ b/SecurityPkg/SecurityPkg.dec
@@ -76,6 +76,14 @@
#
TcgStorageOpalLib|Include/Library/TcgStorageOpalLib.h
+ ## @libraryclass Provides interfaces to access RPMC device.
+ #
+ RpmcLib|Include/Library/RpmcLib.h
+
+ ## @libraryclass Provides interfaces to access variable root key.
+ #
+ VariableKeyLib|Include/Library/VariableKeyLib.h
+
[Guids]
## Security package token space guid.
# Include/Guid/SecurityPkgTokenSpace.h
--
2.24.0.windows.2
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