/**
Finds variable in storage blocks of volatile and non-volatile storage areas.
This code finds variable in storage blocks of volatile and non-volatile storage areas.
If VariableName is an empty string, then we just return the first
qualified variable without comparing VariableName and VendorGuid.
@param[in] VariableName Name of the variable to be found.
@param[in] VendorGuid Variable vendor GUID to be found.
@param[out] AuthVariableInfo Pointer to AUTH_VARIABLE_INFO structure for
output of the variable found.
@retval EFI_INVALID_PARAMETER If VariableName is not an empty string,
while VendorGuid is NULL.
@retval EFI_SUCCESS Variable successfully found.
@retval EFI_NOT_FOUND Variable not found
**/
EFI_STATUS
EFIAPI
VariableExLibFindVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
OUT AUTH_VARIABLE_INFO *AuthVariableInfo
)
{
EFI_STATUS Status;
VARIABLE_POINTER_TRACK Variable;
AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
Status = FindVariable (
VariableName,
VendorGuid,
&Variable,
&mVariableModuleGlobal->VariableGlobal,
FALSE
);
if (EFI_ERROR (Status)) {
AuthVariableInfo->Data = NULL;
AuthVariableInfo->DataSize = 0;
AuthVariableInfo->Attributes = 0;
AuthVariableInfo->PubKeyIndex = 0;
AuthVariableInfo->MonotonicCount = 0;
AuthVariableInfo->TimeStamp = NULL;
return Status;
}
AuthVariableInfo->DataSize = DataSizeOfVariable (Variable.CurrPtr);
AuthVariableInfo->Data = GetVariableDataPtr (Variable.CurrPtr);
AuthVariableInfo->Attributes = Variable.CurrPtr->Attributes;
if (mVariableModuleGlobal->VariableGlobal.AuthFormat) {
AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable.CurrPtr;
AuthVariableInfo->PubKeyIndex = AuthVariable->PubKeyIndex;
AuthVariableInfo->MonotonicCount = AuthVariable->MonotonicCount;
AuthVariableInfo->TimeStamp = &AuthVariable->TimeStamp;
}
return EFI_SUCCESS;
}
/**
Initializes for authenticated varibale service.
@retval EFI_SUCCESS The function successfully executed.
@retval EFI_OUT_OF_RESOURCES Failed to allocate enough memory resources.
**/
EFI_STATUS
AutenticatedVariableServiceInitialize (
VOID
)
{
EFI_STATUS Status;
VARIABLE_POINTER_TRACK Variable;
UINT8 VarValue;
UINT32 VarAttr;
UINTN DataSize;
UINTN CtxSize;
VARIABLE_HEADER VariableHeader;
BOOLEAN Valid;
ZeroMem (&VariableHeader, sizeof (VARIABLE_HEADER));
mVariableModuleGlobal->AuthenticatedVariableGuid[Physical] = &gEfiAuthenticatedVariableGuid;
mVariableModuleGlobal->CertRsa2048Sha256Guid[Physical] = &gEfiCertRsa2048Sha256Guid;
mVariableModuleGlobal->ImageSecurityDatabaseGuid[Physical] = &gEfiImageSecurityDatabaseGuid;
//
// Initialize hash context.
//
CtxSize = Sha256GetContextSize ();
mVariableModuleGlobal->HashContext[Physical] = AllocateRuntimePool (CtxSize);
ASSERT (mVariableModuleGlobal->HashContext[Physical] != NULL);
//
// Check "AuthVarKeyDatabase" variable's existence.
// If it doesn't exist, create a new one with initial value of 0 and EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS set.
//
Status = FindVariable (
mVariableModuleGlobal->VariableName[Physical][VAR_AUTH_KEY_DB],
&gEfiAuthenticatedVariableGuid,
&Variable,
&mVariableModuleGlobal->VariableGlobal[Physical],
mVariableModuleGlobal->FvbInstance
);
if (Variable.CurrPtr == 0x0) {
VarAttr = EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS;
VarValue = 0;
mPubKeyNumber = 0;
Status = UpdateVariable (
mVariableModuleGlobal->VariableName[Physical][VAR_AUTH_KEY_DB],
&gEfiAuthenticatedVariableGuid,
&VarValue,
sizeof(UINT8),
VarAttr,
0,
0,
FALSE,
mVariableModuleGlobal,
&Variable
);
if (EFI_ERROR (Status)) {
return Status;
}
} else {
//
// Load database in global variable for cache.
//
Valid = IsValidVariableHeader (
Variable.CurrPtr,
Variable.Volatile,
&mVariableModuleGlobal->VariableGlobal[Physical],
mVariableModuleGlobal->FvbInstance,
&VariableHeader
);
ASSERT (Valid);
DataSize = DataSizeOfVariable (&VariableHeader);
ASSERT (DataSize <= MAX_KEYDB_SIZE);
GetVariableDataPtr (
Variable.CurrPtr,
Variable.Volatile,
&mVariableModuleGlobal->VariableGlobal[Physical],
mVariableModuleGlobal->FvbInstance,
(CHAR16 *) mVariableModuleGlobal->PubKeyStore
);
mPubKeyNumber = (UINT32) (DataSize / EFI_CERT_TYPE_RSA2048_SIZE);
}
//
// Check "SetupMode" variable's existence.
// If it doesn't exist, check PK database's existence to determine the value.
// Then create a new one with EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS set.
//
Status = FindVariable (
mVariableModuleGlobal->VariableName[Physical][VAR_SETUP_MODE],
&gEfiGlobalVariableGuid,
&Variable,
&mVariableModuleGlobal->VariableGlobal[Physical],
mVariableModuleGlobal->FvbInstance
);
if (Variable.CurrPtr == 0x0) {
Status = FindVariable (
mVariableModuleGlobal->VariableName[Physical][VAR_PLATFORM_KEY],
&gEfiGlobalVariableGuid,
&Variable,
&mVariableModuleGlobal->VariableGlobal[Physical],
mVariableModuleGlobal->FvbInstance
);
if (Variable.CurrPtr == 0x0) {
mPlatformMode = SETUP_MODE;
} else {
mPlatformMode = USER_MODE;
}
VarAttr = EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS;
Status = UpdateVariable (
mVariableModuleGlobal->VariableName[Physical][VAR_SETUP_MODE],
&gEfiGlobalVariableGuid,
&mPlatformMode,
sizeof(UINT8),
VarAttr,
0,
0,
FALSE,
mVariableModuleGlobal,
&Variable
);
if (EFI_ERROR (Status)) {
return Status;
}
} else {
GetVariableDataPtr (
Variable.CurrPtr,
Variable.Volatile,
&mVariableModuleGlobal->VariableGlobal[Physical],
mVariableModuleGlobal->FvbInstance,
(CHAR16 *) &mPlatformMode
);
}
//
// Check "SignatureSupport" variable's existence.
// If it doesn't exist, then create a new one with EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS set.
//
Status = FindVariable (
EFI_SIGNATURE_SUPPORT_NAME,
&gEfiGlobalVariableGuid,
&Variable,
&mVariableModuleGlobal->VariableGlobal[Physical],
mVariableModuleGlobal->FvbInstance
);
if (Variable.CurrPtr == 0x0) {
VarAttr = EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS;
Status = UpdateVariable (
EFI_SIGNATURE_SUPPORT_NAME,
&gEfiGlobalVariableGuid,
mSignatureSupport,
SIGSUPPORT_NUM * sizeof(EFI_GUID),
VarAttr,
0,
0,
FALSE,
mVariableModuleGlobal,
&Variable
);
}
return Status;
}
